Bleeding For 21 Days. Should i do now?

Hello, I Am A 31yr old female, I have always had irregular periods, my previous one was in February 2017 lasted about 14 days, the one before that was in May 2016, so I've always only got a period once a year. I finally got in to see a doctor, she wanted me to start birth control for hormone purpose, she have me medroxyprogesterone, I took for 10 days then started my period April 10th 2017, I started my BC Low-Ogestrel the first day of my period, now I have been heavily bleeding non-stop for 21 days, no sign of stopping anytime soon, when I went for my checkup, my hematocrit and blood count was extremely low, she put me on Ferrous sulfate, also my thyroid was low, my thyroid hormones and antibodies were high, the doctor said basically they are working against each other, so she started me on a low dose of levothyroxine, I'm still bleeding and like I said it is still very heavy, what should I do now?